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fixes #14139 (#15107)

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* fix #14139
* Update lib/pure/collections/heapqueue.nim

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
Co-authored-by: Clyybber <darkmine956@gmail.com>
This commit is contained in:
flywind 2020-07-29 22:18:27 +08:00 • committed by GitHub
commit c645dba038
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2 changed files with 12 additions and 3 deletions
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6
lib/pure/collections/heapqueue.nim
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@ -156,10 +156,10 @@ proc replace*[T](heap: var HeapQueue[T], item: T): T =
proc pushpop*[T](heap: var HeapQueue[T], item: T): T = proc pushpop*[T](heap: var HeapQueue[T], item: T): T =
## Fast version of a push followed by a pop. ## Fast version of a push followed by a pop.
if heap.len > 0 and heapCmp(heap[0], item): result = item
swap(item, heap[0]) if heap.len > 0 and heapCmp(heap.data[0], item):
swap(result, heap.data[0])
siftup(heap, 0) siftup(heap, 0)
return item
proc clear*[T](heap: var HeapQueue[T]) = proc clear*[T](heap: var HeapQueue[T]) =
## Remove all elements from `heap`, making it empty. ## Remove all elements from `heap`, making it empty.

9
tests/stdlib/t14139.nim Normal file
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@ -0,0 +1,9 @@
import heapqueue
var test_queue : HeapQueue[int]
test_queue.push(7)
test_queue.push(3)
test_queue.push(9)
let i = test_queue.pushpop(10)
assert i == 3